爐渣脫硫能力之熱力學模擬計算研究

Thermodynamic Simulation of Desulfurization Capacity of CaO-Al_2O_3-SiO_2 Slags

李棟凱(D. K. Li) ； 屈耿立(G. L. Qu) ； 陳貞光(J. K. Chen) ； 吳威德(W. T. Wu) ； 林啟明(C. M. Lin)

《鑛冶：中國鑛冶工程學會會刊》 59卷1期 (2015/03) Pp. 111-116

https://doi.org/10.30069/MM.201503_59(1).0010

摘要

本研究設計一系列以CaO-Al_2O_3-SiO_2為基礎的三元系統脫硫渣，利用Thermo-Calc熱力學模擬軟體，討論爐渣成分對爐渣脫硫能力以及熔點之影響。結果顯示以1600℃與低碳鋼液反應時，爐渣中的CaO比例超過50 wt.%時可達最佳脫硫效果。添加CaF_2、Na_2O於爐渣對脫硫反應的熱力學效果提升不顯著，但可以降低爐渣熔點、提高流動性，促進脫硫反應的進行。而MnO添加在低鹽基度的爐渣中，其脫硫效果較CaO為佳；在高鹽基度爐渣中，MnO與CaO則未出現加乘的效果。本研究並整合硫分配比之計算與熔點梯度圖進行疊圖，可求得兼顧熱力學與動力學之考慮因素下，較佳之脫硫精煉爐渣成分區間。

關鍵字

脫硫渣 ； 鹽基度 ； 硫分配比

並列摘要

Thermo-Calc software was atitized to calculate the desulfurization capacity of CaO-Al_2O_3-SiO_2 refining slags. When reacting with low carbon steel melt at 1600℃, the desulfurization capacity was higher when CaO concentration was over 50 wt.%. The addition of CaF_2 and Na_2O did little to enhance the desulfurization capacity. However, the addition of CaF_2 and Na_2O increased the fluidity and lowered the melting point of the slags to promote the desulfurization reaction. The addition of MnO increased the desulfurization capacity only in more acidic slags. The addition of CaO increased the desulfurization capacity for slags of higher basicity. The calculations of melting points and sulfur partition ratio were combined to idertify the optimal desulfurization slag composition.

並列關鍵字

Thermo-Calc ； desulfurization slags ； basicity ； sulfur partition ratio